Isort

- Fixed setup.py errors
- Fixed issue 654: Trailing comma count error
- Fixed issue 650: Wrong error message displayed

- Fixed 557: `force_alphabetical_sort` and `force_sort_within_sections` can now be utilized together without extra new lines
- Fix case-sensitive path existence check in Mac OS X
- Added `--no-lines-before` for more granular control over section output
- Fixed 493: Unwanted conversion to Windows line endings
- Fixed 590: Import `as` mucks with alphabetical sorting
- Implemented `--version-number` to retrieve just the version number without the isort logo
- Breaking changes
- Python 2.7+ only (dropped 2.6) allowing various code simplifications and improvements.

IMPORTANT NOTE: This will be the last release with Python 2.6 support, subsequent releases will be 2.7+ only
- Fixed certain one line imports not being successfully wrapped

- Fixed 559 & 565: Added missing standard library imports

- Fixed 553: Check only and --diff now work together again

- Fixed wheel distribution bug